• Robert Hathaway (8/8) Jun 04 2014 I've got a program that reads a text file line by line (using
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (14/22) Jun 04 2014 Consider using byLine() instead. (Important: byLine uses an internal
• Brad Anderson (6/35) Jun 04 2014 Once this[1] gets merged you'll be able to do this:

"Robert Hathaway" <robert.of.santiago gmail.com> writes:

I've got a program that reads a text file line by line (using 
std.stdio readln()) and I'd like to refer to the line number when 
I send a message to stderr upon finding a mis-formatted line.  Is 
there a way to get the current line number?  Of course, I could 
create a counter and increment it with each call to readln, but 
is there a "cool" way of doing this?

Okay, call me lazy... just don't call me late for dinner! :-)

Robert

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 06/04/2014 05:05 PM, Robert Hathaway wrote:
 I've got a program that reads a text file line by line (using std.stdio
 readln())

Consider using byLine() instead. (Important: byLine uses an internal 
buffer for the line; so, don't forget to make a copy if you want to 
store the line for later use.)

 and I'd like to refer to the line number when I send a message
 to stderr upon finding a mis-formatted line.  Is there a way to get the
 current line number?  Of course, I could create a counter and increment
 it with each call to readln, but is there a "cool" way of doing this?

 Okay, call me lazy... just don't call me late for dinner! :-)

 Robert

One cool way is a zipped sequence:

import std.stdio;
import std.range;

void main()
{
     foreach (i, line; zip(sequence!"n", File("deneme.txt").byLine)) {
         writefln("%s: %s", i, line);
     }
}

Ali

"Brad Anderson" <eco gnuk.net> writes:

On Thursday, 5 June 2014 at 00:33:26 UTC, Ali Çehreli wrote:
 On 06/04/2014 05:05 PM, Robert Hathaway wrote:
 I've got a program that reads a text file line by line (using 
 std.stdio
 readln())

 Consider using byLine() instead. (Important: byLine uses an 
 internal buffer for the line; so, don't forget to make a copy 
 if you want to store the line for later use.)

 and I'd like to refer to the line number when I send a message
 to stderr upon finding a mis-formatted line.  Is there a way 
 to get the
 current line number?  Of course, I could create a counter and 
 increment
 it with each call to readln, but is there a "cool" way of 
 doing this?

 Okay, call me lazy... just don't call me late for dinner! :-)

 Robert

 One cool way is a zipped sequence:

 import std.stdio;
 import std.range;

 void main()
 {
     foreach (i, line; zip(sequence!"n", 
 File("deneme.txt").byLine)) {
         writefln("%s: %s", i, line);
     }
 }

 Ali

Once this[1] gets merged you'll be able to do this:

foreach (lineNum, line; File("deneme.txt").byLine().enumerate(1))
       writefln("%s: %s", lineNum, line);

Which is a bit more clear about the intent.

1. https://github.com/D-Programming-Language/phobos/pull/1866